Wastewater from a cement factory contains 0.25 g of Ca2+

Chapter 14, Problem 57P

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QUESTION:

Problem 57P

Wastewater from a cement factory contains 0.25 g of Ca2+ ion and 0.056 g of Mg2+ ion per 100.0 L of solution. The solution density is 1.001 g/mL. Calculate the Ca2+ and Mg2+ concentrations in ppm (by mass).

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QUESTION:

Problem 57P

Wastewater from a cement factory contains 0.25 g of Ca2+ ion and 0.056 g of Mg2+ ion per 100.0 L of solution. The solution density is 1.001 g/mL. Calculate the Ca2+ and Mg2+ concentrations in ppm (by mass).

ANSWER:

Solution 57P:

Here, we are going to determine the concentration of the ions in ppm by mass.

Step 1:

We know that,

---(1)

Given that,

Volume of the solution =100 L =(100 x 1000) mL

                        = 105 mL

Density of solution = 1.001 g/mL =

= 1.001 g

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